1. A compound of formula ##STR00002## where one of the amino groups being optionally in protected form, or a salt or complex thereof.

2. A compound according to claim 1 in unprotected form, in salt form.

3. A compound according to claim 2 as a mono- or disalt.

4. A compound according to claim 3 in the form of an acetate, benzoate, aspartate or pamoate salt.

5. A pharmaceutical composition comprising a compound according to claim 1 or a pharmaceutically acceptable salt thereof, in association with one or more pharmaceutically acceptable diluent(s) or carrier(s) therefor.

6. A pharmaceutical composition according to claim 5, in a sustained release form or in a topical form.

7. A pharmaceutical composition according to claim 5, for use in combination with an immunosuppressive agent, an anti-inflammatory agent, a GH secretagogue receptor modulating agent, a GH receptor antagonist, an insulin secretagogue, an insulin
secretion enhancer, an insulin sensitizer, a low dose of insulin, an agent having anti-angiogenetic effects or a chemotherapeutic agent.

8. A compound of formula ##STR00003## where one of the amino groups being optionally in protected form, or a salt or complex thereof and R.sup.1 is a chelating agent, optionally complexed with a detectable or a radiotherapeutic element.

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